Share your experience!
Dears,
my mobile is Xperia SP, i am facing an issue in the screen, when i press the power key to unlock the mobile, i face a blank black screen but the backlight is turned on, i have to lock and unlock again to work. another issue, when someone calls me, the mobile is ringing while the screen is blank black screen, i have to lock and unlock again to see the caller.
Help Please 
what do u mean by repair exactly?
Re-install the latest software
are you guessing a solution or this is the solution?
Your phone works fine in other situations?Try to boot it in safe mode,see if that occurs:
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008#U348008
